erc20Approvals[keccak256(abi.encodePacked(msg.sender, token))] = erc20Approvals[keccak256(abi.encodePacked(msg.sender, token))].sub(amount);
function delegatedTransferERC20(address token,address to,uint256 amount) external {
    if(msg.sender != _getOwner()) {
        require(erc20Approvals[keccak256(abi.encodePacked(msg.sender, token))] >= amount,"Account not approved to transfer amount");
    }
    // check for sufficient balance
    require(IERC20(token).balanceOf(address(this)) >= (getBalanceLocked(token).add(amount)).add(timelockERC20Balances[token]),"UniversalVault: insufficient balance");

    erc20Approvals[keccak256(abi.encodePacked(msg.sender, token))] = erc20Approvals[keccak256(abi.encodePacked(msg.sender, token))].sub(amount);

    // perform transfer
    TransferHelper.safeTransfer(token, to, amount);
}
   erc20Approvals[keccak256(abi.encodePacked(msg.sender, token))] = erc20Approvals[keccak256(abi.encodePacked(msg.sender, token))].sub(amount);
